the first ever Voodoo5 5500 AGP had Dual head:

well this picture is the comdex 5500 AGP:

there is always a bigger one of it:

By the looks of it, it does have traces, so maybe it has real Authentic 3dfx VSA-100's onit afterall.
I wonder what happened to it, really, it's one of my favourite Voodoo cards around.
So Osckhar's version of it :

is actually the modified version of the Comdex 1999 card, it has coils

instead of 2 square like condensators, so the 3dfx Voodoo5 5500 AGP 64MB comdex 1999 card is still out there somewhere.
after Osckhar's model the final product was meant to be like this Prototype:

so that would complete the 5500 AGP's past on how it was designed, the AGP x4 models were actually meant as updated models, for newer motherboards I think.